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Analog Devices Inc./Maxim Integrated MAX6791TPZD3+
- Part No.:
- MAX6791TPZD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPZD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,876
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Product details
Overview
MAX6791TPZD3+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator with integrated supervisory functions for automotive systems. It delivers up to 150mA per output (OUT1 and OUT2), supports 5V to 72V input range, features fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V outputs, and includes push-pull RESET, windowed watchdog timer, and HOLD self-holding control - used in engine control units and ADAS power management.
For engineers reviewing the MAX6791TPZD3+ datasheet, MAX6791TPZD3+ pinout, MAX6791TPZD3+ application, or MAX6791TPZD3+ equivalent, key selection criteria include its AEC-Q100-compatible 20-pin TQFN package, 68μA quiescent current at 8V input, 50ms capacitor-adjustable reset timeout (D3), 87.5% reset threshold for OUT1, and dual enable/hold logic for ignition-controlled power sequencing.
Technical Context
The MAX6791TPZD3+ implements a dual-regulator architecture with independent OUT1 (adjustable or preset) and fixed 5V OUT2. Its windowed watchdog timer uses WDS0/WDS1 inputs to select fast/slow fault detection thresholds (tWD1/tWD2), while RESET assertion is triggered by either OUT1 voltage drop below 87.5% of nominal or watchdog timeout violation.
Supervisory logic integrates a power-fail comparator (PFI/PFO), thermal shutdown (+165°C), short-circuit protection (240mA limit), and reverse-battery protection via GATEP-driven pFET - all operating across -40°C to +125°C with guaranteed performance over full automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external clamping |
| Quiescent Current | 68μA typical at VIN = 8V - enables always-on ECU modules with <100μA system standby draw |
| Output Current | 150mA per output (OUT1/OUT2) - sufficient for MCU core + peripheral rail in compact ECUs |
| Reset Timeout | 50ms (D3 option) - ensures reliable microprocessor initialization after brownout recovery |
| Reset Threshold | 87.5% of OUT1 nominal voltage - matches common 3.3V logic supply tolerance (2.888V min) |
| Watchdog Type | Windowed (MAX6791/MAX6792 only) - detects both stuck-high and stuck-low WDI faults |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for 2.7W dissipation in high-ambient under-hood environments |
Pinout & Package
MAX6791TPZD3+ is housed in a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, exposed pad). The exposed pad must be soldered to PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Main regulator output: fixed 3.3V (per Z designation) or adjustable 1.8V–11V; requires ≥10μF ceramic output capacitor |
| 3 | SET1 | Feedback node for OUT1; grounded for preset 3.3V operation, connected to resistive divider for adjustable mode |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI falls below 1.231V - used for early battery-low warning |
| 5 | CSWT | Watchdog timeout adjust input; tied to OUT1 for fixed 280ms timeout or capacitor-grounded for adjustable period |
| 6 | CSRT | Reset timeout adjust input; tied to OUT1 for fixed 50ms (D3) timeout or capacitor-grounded for user-defined delay |
| 7 | GND | Analog/digital ground reference; connects internally to exposed pad (EP) |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1 drops below 87.5% or watchdog fault occurs |
| 9, 10 | WDS1, WDS0 | Windowed watchdog ratio select inputs; set to define tWD1/tWD2 timing windows (e.g., 8× ratio) |
| 11 | WDI | Watchdog input; requires periodic edge transition within tWD2 (max 520ms) to prevent reset assertion |
| 12 | HOLD | Active-low hold input; forces OUT1 ON even after ENABLE1 goes low - enables self-holding ignition circuits |
| 13, 14 | OUT2 | Fixed 5V auxiliary output; supplies sensors or interface ICs independently of OUT1 regulation |
| 15 | ENABLE2 | Active-high enable for OUT2; allows independent control of 5V rail during system sleep/wake cycles |
| 16 | PFI | Power-fail comparator input; connected to resistor divider from battery to set custom undervoltage warning threshold |
| 17, 18 | IN | Main input supply pins; bypassed with ≥1μF ceramic capacitor to GND near device |
| 19 | GATEP | pFET gate drive output; controls external high-side p-channel MOSFET for reverse-battery protection |
| 20 | ENABLE1 | Active-high enable for OUT1; pulled down internally (0.5μA sink) - driven by ignition switch signal |
| EP | Exposed Pad | Internally connected to GND; must be soldered to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | OUT1 (3.3V preset) + OUT2 (fixed 5V) - powers mixed-voltage subsystems without external LDOs |
| Windowed watchdog timer | Simultaneous detection of WDI stuck-high (slow fault) and stuck-low (fast fault) - eliminates single-point failure modes |
| Self-holding circuit support | HOLD input maintains OUT1 ON after ignition key release - enables start-stop ECU retention without external latch |
| Reverse-battery protection driver | GATEP drives pFET gate directly - replaces lossy series diode with <50mΩ RDS(on) solution |
| Automotive-grade supervision | RESET with 50ms timeout and 87.5% threshold - meets ISO 16750-2 load-dump and cold-crank robustness requirements |
Applications
| Engine Control Unit (ECU) Power Management | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Powers MCU core (3.3V) and CAN transceiver (5V) from 12V battery under stop-start cycling and load-dump conditions. IC Role / Device Role / Timing Role: Dual-output regulator with HOLD-based self-hold and RESET supervision ensures deterministic boot after cranking recovery. Use Value: 68μA quiescent current extends battery life during 30-day parking; 72V input rating eliminates need for external TVS clamping. | Use Scenario: Supplies image sensor (3.3V) and ISP processor (5V) in rear-view camera module exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Dual LDO with thermal shutdown (+165°C) and watchdog monitors ISP firmware execution integrity. Use Value: 5mm × 5mm TQFN package fits tight camera housing; windowed watchdog prevents false resets from EMI-induced WDI glitches. |
| Body Control Module (BCM) Gateway | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Provides regulated 3.3V for LIN gateway MCU and 5V for analog sensor front-end in door module. IC Role / Device Role / Timing Role: PFI comparator monitors 12V supply to trigger orderly shutdown before battery disconnect; RESET coordinates MCU reset sequence. Use Value: Adjustable PFI threshold enables precise battery state-of-charge warning; 1.231V internal reference ensures ±1% trip accuracy. | Use Scenario: Powers torque sensor signal conditioning circuitry in EPS column-mounted assembly subject to vibration and thermal stress. IC Role / Device Role / Timing Role: GATEP-driven pFET provides reverse-battery protection; HOLD input sustains power during brief ignition interruptions. Use Value: Eliminates discrete reverse-protection diode (reducing 0.4V dropout and 1.2W loss at 3A); AEC-Q100 qualified for safety-critical EPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPZD3+ | Same pinout, identical specs, but includes windowed watchdog with selectable 8×/16×/64× ratios (vs. fixed 8× on MAX6791) | Preferred where fine-grained watchdog timing flexibility is required for multi-core firmware validation | Select MAX6792TPZD3+ if adjustable watchdog window ratio is needed; otherwise MAX6791TPZD3+ offers cost-optimized fixed-ratio implementation |
| TLV70733PDQNR | Single-output 3.3V LDO only; 5V to 6.5V input range; no watchdog, RESET, or HOLD functions; SOT-23-5 package | Limited to low-voltage, non-supervised applications - cannot replace dual-rail or automotive supervision features | Only suitable as partial functional substitute where 5V rail and supervisory features are handled externally |
Compared with MAX6792TPZD3+, the MAX6791TPZD3+ provides identical dual-output regulation and HOLD functionality but with fixed 8× windowed watchdog ratio - simplifying design validation. Unlike TLV70733PDQNR, it delivers full automotive supervision (RESET, watchdog, PFI) and 72V input capability essential for under-hood deployment.
Availability
MAX6791TPZD3+ is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control gateways, and electric power steering sensor interfaces requiring stable component supply across automotive production lifecycles.
Supply support for MAX6791TPZD3+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.
The MAX6791–MAX6796 family targets high-reliability automotive power systems, integrating dual LDO regulation, microprocessor supervision, and reverse-battery protection in a single AEC-Q100-qualified package.
FAQ
What output voltage does MAX6791TPZD3+ deliver on OUT1?
The MAX6791TPZD3+ delivers a fixed 3.3V on OUT1, indicated by the 'Z' in the part number per Maxim's ordering guide. This is confirmed in the Electrical Characteristics table under "T/S" output voltage grade (3.206V to 3.360V at 1mA load). OUT2 is fixed at 5V. SET1 is internally grounded for this variant, disabling adjustable mode.
What does the 'D3' suffix mean in MAX6791TPZD3+?
The 'D3' suffix in MAX6791TPZD3+ specifies a 50ms reset timeout period, selected from Maxim's standard CSRT-coded options (D0=35μs, D1=3.125ms, D2=12.5ms, D3=50ms, D4=200ms). This value is factory-trimmed and applies when CSRT is tied to OUT1; using an external capacitor allows adjustment outside these presets.
Does MAX6791TPZD3+ support reverse-battery protection?
Yes, MAX6791TPZD3+ supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When reverse polarity is applied, the internal circuitry disables GATEP output, blocking current flow. This eliminates the power loss and heat generation associated with series Schottky diodes in traditional protection schemes.
How is the reset threshold determined for MAX6791TPZD3+?
The reset threshold for MAX6791TPZD3+ is 87.5% of the OUT1 nominal voltage, as designated by the 'Z' suffix per Table 1 in the datasheet. For its 3.3V OUT1, this yields a threshold of 2.888V (min) to 2.970V (max) across temperature. The threshold is internally fixed and ratiometric - no external components are required to set it.
Is MAX6791TPZD3+ qualified for automotive use?
Yes, MAX6791TPZD3+ is AEC-Q100 qualified for automotive applications. It is specified for -40°C to +125°C operation, includes thermal shutdown (+165°C), short-circuit protection, and is manufactured in an automotive-grade process. The '+' suffix denotes lead-free packaging, and the device meets stringent automotive reliability and qualification standards.
MAX6791TPZD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPZD3+ FAQ
1.How can I place an order for MAX6791TPZD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPZD3+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6791TPZD3+ reliable?
The price and inventory of MAX6791TPZD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPZD3+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPZD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPZD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPZD3+?
MAX6791TPZD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPZD3+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6791TPZD3+?
For technical support, including MAX6791TPZD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPZD3+ requirements.
6.How does Aetrix verify that MAX6791TPZD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPZD3+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6791TPZD3+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPZD3+?
All MAX6791TPZD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPZD3+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6791TPZD3+ part is unused and in its original packaging.
Return procedure for MAX6791TPZD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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